Valve device for an internal combustion engine

ABSTRACT

The invention refers to a valve device for a combustion engine which includes a combustion chamber ( 1 ) and at least one channel ( 5 ) for communication between the combustion chamber ( 1 ) and an external space. The valve device includes a rotatable valve body ( 13 ), which is provided in said channel ( 5 ) and includes a passage ( 14 ) extending in a direction through said valve body ( 13 ). The valve body ( 13 ), which is rotatable around an axis of rotation forming an angle to the direction (p) of said passage ( 14 ), is arranged to open and close, respectively, said channel ( 5 ) by means of said passage ( 14 ) by rotation, a rotary motor ( 16 ) separated from the combustion engine is provided.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention refers to valve device for a combustion engineincluding a combustion chamber and at least one channel forcommunication between the combustion chamber and an external space.

2. Description of the Prior Art

Such valve devices for combustion engines are known through, forinstance, SE-B-401 387. The known valve device includes a rotatablevalve body having a passage for the inlet channel and a passage for theoutlet channel, which passages extend through the rotatable valve body.This provides for rotation of the valve body by means of a drive-wheelwhich is connected to the crank shaft of the combustion engine via adrive belt. The rotation of the valve body will thereby be timelyrelated to the rotation of the crank shaft, and in the example providedin this patent the relation of the numbers of revolutions is 1:4.Consequently, the known valve body rotates at a substantially lowervelocity than the crank shaft, which is an advantage per se.Furthermore, the valve body rotates continuously together with the crankshaft, i.e. the valve body rotates the whole time at a speed which isproportional to the speed of the crank shaft. This means that the inletand outlet passages will be opened and closed successively and merely besubstantially completely open during a very short time period. Thesuction procedure and the exhaust procedure will thereby be disturbed bythe fact that these passages are merely partly open during a great partof said procedures. Certainly, SE-B-401 387 proposes to provide moveablesealings in the spaces at each side of the inlet and outlet channel,respectively, of the combustion chamber. The moveable additional valvesthus enable a certain control of the times for the opening and theclosing of the inlet and the outlet valves, respectively, as a functionof the number of revolutions of the engine, for instance. However, thepossibilities to vary the times appear to be limited and in addition,the construction is fairly complicated and involves a plurality offurther components.

U.S. Pat. No. 4,976,227 discloses a combustion engine having rotatablevalve bodies for the opening and closing, respectively, of the suctionchannel and the exhaust channel to the combustion chamber of thecombustion engine. However, this document does not disclose any commonrotary motor but the rotation of the valve body is provided by means ofan electromagnetic arrangement, a so-called solenoid, wherein theelectromagnets are activated and deactivated alternately in order toprovide a discontinuous movement of the valve body. Thus, the valvebodies will be completely still in the positions obtained. No measuresare disclosed to make the valve body rotate in a desired direction.

SUMMARY OF THE INVENTION

The purpose of the present invention is to remedy the problem mentionedabove and provide a valve device which has a rotatable valve body andwhich enables a more instantaneous opening and closing of a suctionand/or exhaust channel of a combustion engine. Furthermore, the presentinvention aims to provide improved possibilities to control such avalve.

The present invention obtains this purpose by the initially definedvalve device characterised by a rotary motor being separated from thecombustion engine and being arranged to provide said rotation. Such aseparate rotary motor may be driven independently of the rotation of thecrank shaft, which permits the valve body to be discontinuously rotated.That is, the valve body is rotated at different speeds and thereby veryfast during the opening or closing phase of the valve device. In thisway it is possible to avoid a slowly successive opening and/or closingof the valve device. Furthermore, an advantage of such a rotating valveis that it merely needs to rotate one revolution, whereas the crankshaft rotates four revolutions, i.e. the wear may be kept on a lowlevel. Furthermore, such a rotating valve has substantially fewermechanical parts than conventional cam shaft controlled valves.

According to an embodiment of the invention, the rotary motor isconsequently arranged to rotate the above mentioned valve body from oneof its positions to an adjacent one of its positions by a first highrotation velocity, to then rotate the valve body from this adjacentposition by a second low rotation velocity, and to rotate the valve bodyfrom this adjacent position to the next adjacent position. The firsttime period, during which the valve body rotates from one position toanother, is consequently advantageously substantially shorter than thesecond time period during which the valve body rotates in a position.The actual position thus includes an interval and not only one singleposition. This means that an inlet channel may be kept completely openduring substantially the whole suction stroke of the engine and anoutlet valve may be kept substantially completely open during theexhaust stroke. The second low rotation velocity may be permitted tovary with the number of revolutions per time unit of the combustionengine in such a manner that, at a relatively low number of rounds, thesecond rotation velocity may be substantially zero, i.e. the valve bodyis essentially stationary. At a relatively high number of revolutions,the second low rotation velocity may have a low value above zero, i.e.the valve body may advantageously be permitted to rotate at a lowvelocity. This facilitates the achievement of a very high first velocityfor moving the valve body from one of said positions to an adjacentposition.

According to a further embodiment of the invention, a control unit isarranged to control the rotation of the rotary motor. Thereby, a firstsensor member may be arranged to sense the position of a crank shaft ofsaid combustion engine. It is thereby possible to control the rotationof the rotary motor by means of the control unit in response to thesensed crank shaft position. That is, the control unit may initiate avery quick rotation of the valve body at a certain crank shaft positionin order to open an inlet valve, for instance, at the upper dead center,and control the rotary motor in such a way that it does not rotateduring a certain angle interval. Where the combustion engine is afour-stroke engine, the first sensor member advantageously includes twosensors which are known per se, which enable an exact identification ofthe position of each piston with regard to the whole stroke, tworevolutions of the crank shaft. Furthermore, a second sensor member maybe arranged to sense the number of revolutions per time unit of thecombustion engine, wherein the control unit is arranged to control therotation of the rotary motor in response to the number of revolutions.In such a manner, it is easily possible to change the opening andclosing time, respectively, of the valve body in response to the numberof revolutions of the combustion engine. Furthermore, the control unitmay be arranged to control the valve body in order to control the numberof revolutions per time unit of the combustion engine. Thereby, it ispossible to dispense with conventional throttles in the carburettor orwith the air control in case of direct injection.

According to a further embodiment, in which the combustion engineincludes an inlet channel for the supply of air and fuel to thecombustion chamber and an outlet channel for the discharge of combustiongases from the combustion chamber, the valve device includes a firstrotatable valve body, which is provided in the inlet channel andincludes a first passage extending in a direction through the firstvalve body. In this further embodiment, a second rotatable valve body isprovided in said outlet channel and includes a second passage extendingin a direction through the second valve body. Such valve bodies areespecially suitable for controlling the suction and the exhaust in afour-stroke engine.

According to a further embodiment of the invention, the first and thesecond valve bodies form a body with a common axis of rotation, whereinthe direction of the first passage forms an angle to the direction ofthe second passage. Both the inlet valve and the outlet valve for acombustion chamber may thereby be controlled by one single rotary motor.This angle between the directions of the passages may be between 30° and60°, preferably about 45°.

According to another embodiment of the invention, the first valve bodyis provided beside the second valve body, wherein their axes of rotationof the valve bodies are substantially parallel. Two rotating valves areconsequently provided for each combustion chamber, i.e. one for theinlet valve and one for the outlet valve. The first valve body and thesecond valve body may advantageously be driven by a common rotary motor,wherein a transferring member having an input shaft and an output shaft,which do not coincide, may be arranged to transfer a movement ofrotation of the rotary motor to at least one of these first and secondvalve bodies. Alternatively, the first valve body and the second valvebody may be driven by a respective separate rotary motor. This createspossibilities for controlling the inlet valve and the outlet valveindependently of each other; for instance the time for the opening ofthe inlet valve may be adjusted without influencing the time for theopening of the outlet valve. Thereby, the control unit may be arrangedto control the phase position of one of the valve bodies in relation tothe phase position of the other valve body in response to said number orrounds.

According to a further embodiment of the invention, the rotary motorincludes an electric rotary motor. An electric motor may be controlledin an easy manner and react quickly on different control signals.Preferably, the electric motor includes a synchronous motor. Thesynchronous motor may be of a high-speed type with a low inductance anda low moment of inertia. Such a motor may be accelerated very quickly.Thanks to the low inductance, the voltage will rapidly feed thenecessary current through the windings of the synchronous motor. A lowmoment of inertia may, for instance, be provided by the feature that thesynchronous motor has a rotor with a low weight. Such a low weight maybe obtained by a magnet material including samarium/cobalt and/orneodymium. It is also possible to let the rotary motor include apneumatic and/or hydraulic rotary motor.

According to a further embodiment of the invention, the combustionengine includes more than one combustion chamber, wherein the valve bodyfor at least two combustion chambers may have a common axis of rotationand may be connected to each other by a power transferring connectingmember. The connecting member may advantageously include a permanentmagnet of each of the valve bodies and be arranged to enablecontact-free power transmission from one valve body to an adjacent valvebody. Adjacent valve bodies may thereby be completely separated fromeach other, for instance by any wall member, which enables a propersealing between the valve bodies. However, it is also possible to letthe connecting member include a connecting element extending between twoadjacent valve bodies.

According to a further embodiment of the invention, the valve body isenclosed in a sleeve, which is arranged to be received by a cylinderhead of said combustion engine. Such a sleeve with a valve body may beprovided as a module unit, which facilitates replacement and mounting ofthe valve device in the cylinder head of a combustion engine.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is now to be explained more closely by means ofpreferred embodiments and with reference to the drawings attached,wherein:

FIG. 1 discloses a transverse section through a part of a combustionengine with a valve device according to one embodiment of the invention;

FIG. 2 discloses a longitudinal section through a part of a combustionengine in FIG. 1;

FIG. 3 discloses a longitudinal section through a part of a combustionengine similar to the one of FIG. 2 according to a second embodiment ofthe invention;

FIG. 4 discloses a longitudinal section through a part of a combustionengine with a valve device according to a third embodiment of theinvention;

FIG. 5 discloses a transverse section through a part of a combustionengine similar to the one in FIG. 4 according to a fourth embodiment ofthe invention;

FIG. 6 discloses a longitudinal section through a part of a combustionengine with a valve body according to a fifth embodiment of theinvention; and

FIG. 7 discloses a cross-section through a rotary motor of the deviceaccording to the invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

FIGS. 1 and 2 schematically disclose an upper part of a four-strokecombustion engine. The combustion engine may, for instance, include fourcylinders or combustion chambers 1, two of which are disclosed in FIG.2. However, it is to be noted that the invention is applicable to manydifferent types of combustion engines, four-stroke engines as well astwo-stroke engines. The number of cylinders or combustion chambers 1 maybe arbitrary. Furthermore, the invention is applicable to Otto enginesas well as to diesel engines.

The disclosed combustion chambers 1 are provided in an engine block 2 ina conventional manner. Above the engine block 2, a cylinder head 3 isprovided. The cylinder head 3 may be mounted to the engine block 2 in aconventional manner by means of indicated bolts 4. The cylinder head 3includes an inlet channel 5 for each combustion chamber 1 for the supplyof a mixture of fuel and air and an outlet channel 6 for each combustionchamber 1 for the discharge of combustion gases. Furthermore, a piston 7is provided in each combustion chamber 1. Each piston 7 is connected ina conventional manner via a connecting rod (not disclosed) to a crankshaft, which is indicated by the dotted-dashed line 8. The crank shaft 8is connected to a tooth wheel 9 located outside the engine block 2. Bymeans of sensor members 10 and 11, schematically disclosed, the positionand the number of revolutions, respectively, of the crank shaft 8 may besensed by sensing the positions of the tooth wheel 9. It is to be notedthat the position sensing member 10 may include a resolver or a pulsesensor and be of such a type that it makes it possible to differ betweentwo revolutions forming a stroke in a four-stroke engine. The sensormembers 10 and 11 are connected to a control unit 12, which is to bedisclosed more closely below.

According to the present invention, the valve device controlling theopening and closing of the inlet channel 5 and the outlet channel 6includes a valve body 13, which is rotatable around an axis y ofrotation. In the example disclosed, the axis y of rotation is parallelwith the axis of rotation of the crank shaft 8. In the example disclosedin FIGS. 1 and 2, a rotatable valve body 13 is provided for eachcombustion chamber 1. Consequently, the valve body 13 includes twopassages, namely, one inlet passage 14 and one outlet passage 15. Eachpassage 14, 15 extends in a direction p, and the direction p of theinlet passage 14 forms an angle v to the direction p of the outletpassage 15, which in the example disclosed is about 45°. As appears fromFIG. 2, the inlet passage 14 is provided to be located in line with theinlet channel 5 two times per revolution of the rotating valve body 13.In the same way, the outlet passage 15 is arranged to be located in linewith the outlet channel 6 two times per round. The rotation of the valvebodies 13 is provided by means of a separate electric drive motor in theform of a rotary motor 16 via a power-transmission arrangement to bedescribed more closely below. In the same way as for the crank shaft,the device may include members (not disclosed) for measuring andtransferring the rotation position of the rotary motor 16 for each pointof time.

Each valve body is provided in a sleeve including an upper part 17′ anda lower part 17″. The rotatable valve body 13 is substantiallycompletely enclosed in the sleeve 17′, 17″, which in its turn isreceived in a recess of the cylinder head 3. The sleeve 17′, 17″ and thevalve body 13 provided therein form a separate module unit which iseasily replaceable. Each valve body 13 has two end portions, which eachincludes a permanent magnet 18. A power transmission element is providedwhich includes a rotatable permanent magnet 20 and is located betweeneach such module unit[, a power transmission element is provided, whichincludes a rotatable permanent magnet 20]. Furthermore, the rotary motor16 has an output shaft with an outer end portion which includes apermanent magnet 21. The permanent magnet 21 and the adjacent permanentmagnet 18 of the first rotatable valve body 13 will thus take a fixedturning position in relation to each other as well as also the secondpermanent magnet 18 of the first valve body 13 and the permanent magnet20 of the power transmission element 19, etc. The rotation of the rotarymotor 16 may thus be transferred to all valve bodies 13 in the row ofcombustion chambers 1 included by the motor.

A sealing element 22 is provided above each combustion chamber 1 betweenthe rotatable valve body 13 and the engine block 2. The sealing element22 has, as appears from FIG. 1, a concave cylindrical surface, againstwhich the surface of the valve body 13 abuts. Furthermore, the sealingelement 22 has a plane lower surface, which partly abuts the uppersurface of the engine block 2. A passage 23 extends from the uppersurface of the engine block 2 to the combustion chamber 1. As appearsfrom FIGS. 1 and 2, the sealing element 22 extends with a part of thelower surface into the passage 23. This means that, during thecompression stroke and the combustion stroke, the sealing element 22will be pressed against the rotatable valve body 13 and ensure thesealing of the combustion chamber 1 in relation to the surroundings.

In a four-stroke motor having the valve device according to theinvention, the valve body 13 will take the position disclosed in FIGS. 1and 2 during the suction stroke of the motor. Thereby, the control unit12 controls the rotary motor 16 whereby, during an essential part of thesuction stroke, the valve body 13 is substantially still-standing at lownumbers of revolutions of the combustion engine in the positiondisclosed. When the crank shaft 8 has reached the lower dead point, i.e.bottom dead center, the piston 7 turns upwardly at the same time as thecontrol unit 12 activates the rotary motor 16 to rotate the rotatablevalve body 13 by a high velocity about 22, 5°. During the compressionstroke, the valve body 13 will thus close the inlet channel 5 and alsothe outlet channel 6. When the crank shaft 8 has reached the upper deadpoint, i.e. top dead center, the combustion is initiated by means of aschematically disclosed spark-plug 24, whereas the control unit 12initiates the rotary motor 16 to rotate the rotatable valve body 13 afurther quarter of a revolution. Consequently, both the inlet channel 5and the outlet channel 6 will be closed also during the combustionstroke. When the crank shaft 8 has reached the lower dead point onceagain, the control unit 12 initiates the rotary motor 16 to rotate thevalve body 13 a further quarter of a revolution, which means that theoutlet passage 15 will be in line with the outlet channel 6, i.e. thecombustion gases may leave the combustion chamber 1 during the exhauststroke. Consequently, the rotary motor 16 will rotate discontinuously,i.e. be substantially still-standing or rotate at a very low velocityduring a relatively long period of time and rotate at a very highvelocity during a relatively short period of time between the differentstrokes of the combustion engine. The rotary motor 16 is arranged torotate in one single direction of rotation. This may be obtained bymeans of the control unit 12, which includes suitable electronics knownper se.

FIG. 3 discloses schematically a second embodiment of the invention. Inthe different embodiments, components having substantially the samefunction have been provided with the same reference signs. The secondembodiment differs from the first embodiment merely in that the valvebodies 13 are connected to each other via a mechanical powertransmission connecting member, which is disclosed schematically at 25between two adjacent valve bodies 13. According to this embodiment, thepower transmission element 19 between the sleeves 17′, 17″ is dropped.Each rotating valve body 13 includes an inlet shaft pin 26 and an outletshaft pin 27. An outlet shaft 27 of a valve body 13 is thus mechanicallyconnected at 25 to an inlet shaft pin 26 of an adjacent valve body 13.Also in this case, the sleeve 17′, 17″ together with the enclosedrotatable valve body 13 form a module unit which is easily replaceable.The shaft pins 26, 27 are sealed against the sleeve 17′, 17″ by means ofsealing rings 28 extending around each shaft pin 26, 27.

FIG. 4 discloses schematically a third embodiment of the inventionhaving a separate rotatable valve body 13′ for the inlet channel 5 and aseparate rotatable valve body 13″ for the outlet channel 6. Therotatable valve bodies 13′, 13″ are provided in such a way that theiraxes of rotation, y′ and y″, respectively, are parallel to each other.In the embodiment disclosed in FIG. 4, the two rotatable valve bodies13′, 13″ have a common rotary motor 16, which rotates the valve bodies13′,13″ via a power transmission member 29 having an inlet shaft and anoutlet shaft which do not coincide.

FIG. 5 discloses schematically a fourth embodiment, which merely differsfrom the embodiment of FIG. 4 in that the rotatable valve bodies 13′ and13″ have been provided with a respective separate rotary motor 16′, 16″.It is thereby possible to control the rotating valve bodies 13 ′ for theinlet channels 5 of the engine independently of the rotating valvebodies 13″ for the outlet channels 6 the engine. Consequently, it ispossible to phase displace the opening and/or closing points of time forthe inlet channel 5 and the outlet channel 6 in relation to each otherdependent on different engine parameters or states, for instance thenumber of revolutions or the load of the engine.

FIG. 6 discloses a fifth embodiment of the invention. In thisembodiment, the valve body 13 is rotatably journalled in a circularcylindrical recess in a cylinder head including two parts 3′ and 3″,which are connected to each other along a dividing plane extendingthrough a middle plane of the cylindrical recess. According to thisembodiment, the valve body 13 includes merely one passage 30, whichforms an inlet channel by the position disclosed in continuous lines,i.e. the passage 30 is in line with the inlet channel 5. In the positiondisclosed by dotted lines, the passage 30 forms an outlet passagetogether with the outlet channel 6. Preferably, the passage 30, seen ina cross-section through the passage, has a rectangular shape in order toachieve a cross-sectional area as large as possible. According to thisembodiment, the valve body 13 will further form the upper limiting wallof the combustion chamber 1. Sealing members 31 may be provided in thelower part 3′ of the cylinder head.

As appears from FIG. 6, the valve body 13 in this embodiment has acavity 32, which contributes to a low weight of valve body 13 andthereby to a low moment of inertia. It is to be noted that in theembodiment disclosed above, the valve body 13 may have such a cavity 32.It is also possible to provide the valve body 13 with further cavities(not disclosed) in order to convey a cooling medium through the valvebody 13. The cavity disclosed may also be arranged to receive a flow ofa cooling medium.

The valve body 13 may advantageously be manufactured in aluminium or anyother light metal or light metal alloy in the different embodiments. Theouter surface of the valve body 13 may have a hardened layer, forinstance of chromium nitrate.

FIG. 6 also discloses cooling channels 33 for the cooling of thecylinder head. Also the embodiments disclosed above may include suchcooling channels 33. It ought to be possible to provide cooling channels33 in such a manner that a cooling medium does not need to be conveyedthrough the valve body 13.

FIG. 6 illustrates a one-cylinder combustion engine. Thereby, the axisor rotation of the valve body 13 may either extend in parallel with thecrank shaft of the combustion engine (not disclosed in FIG. 6) orperpendicular to the crank shaft of the combustion engine. By such anarrangement it is also possible to provide several cylinders in a row,where the axis of rotation of the valve body extends perpendicularly tothe crank shaft of the combustion engine, and wherein each cylinderincludes a separate valve body 13 and having its own separate rotarymotor 16, not disclosed in FIG. 6. Thereby, very good possibilities tocontrol individually the combustion process in the individual cylindersmay be obtained.

FIG. 7 discloses schematically the structure of the rotary motor 16 inthe form of an electric synchronous motor. The synchronous motor, whichis driven in one direction of rotation, preferably gives 0.5-0.7 Nm/4000rpm. The synchronous motor disclosed has eight poles, but alsosynchronous motors having other numbers of poles may be employed, forinstance four, six, ten, twelve poles. The synchronous motor includes,in a conventional manner, a stator 40 and a rotor 41. In the stator,there is a winding 42 for each pole and the rotor 41 has a correspondingnumber of magnets 43. The magnets 43 are of a type which includessamarium/cobalt and/or neodymium.

It is to be noted that the control unit 12 may be provided with alocking device, which is openable by inputting a code and whichinterrupts the electric connection between the control unit 12 and thesensor member 10 and 12. This may prevent an unallowable use of thevehicle when the control unit 12 is locked.

The present invention is not limited to the embodiments disclosed butmay be varied and modified within the scope of the following claims.

For instance, it is to be noted that the separate rotary motor 16 alsomay be of another type than an electric motor. The valve deviceaccording to the invention is also realisable by a pneumatic rotarymotor or a hydraulic rotary motor.

Furthermore, the possibility to provide a separate rotary motor for eachvalve body 13, 13′, 13″ is to be mentioned. Such rotary motors may beprovided axially in relation to the valve bodies or be located laterallywith respect to each valve body.

What is claimed is:
 1. A valve device for a combustion engine includinga combustion chamber and at least one channel for communication betweenthe combustion chamber and an external space, the valve devicecomprising: a rotatable valve body which is provided in said channel,said valve body including a passage extending in a direction through thevalve body, the valve body being rotatable around an axis of rotationforming an angle to the direction of said passage which is arranged toform an open position and a closed position of said channel by rotationin one rotary direction around said axis of rotation; and a rotary motorseparate from the combustion engine and arranged to provide saidrotation, wherein the rotary motor is arranged to rotate said valve bodyfrom one of said positions to an adjacent of said positions by a firsthigh rotation velocity, to rotate said valve body in this adjacentposition by a second rotation velocity at a relatively lower rotationrate than said first high rotation velocity, and thereafter to rotatesaid valve body from said adjacent position to the next adjacentpositions by the first high rotation velocity.
 2. A valve deviceaccording to claim 1, wherein the rotary motor is arranged to providethe rotation of said valve body in a discontinuous manner.
 3. A valvedevice according to claim 1, including a control unit is arranged tocontrol the rotation of the rotary motor.
 4. A valve device according toclaim 3, wherein a first sensor member is operatively connected to saidcontrol unit and is arranged to sense the position of a crank shaft ofsaid combustion engine.
 5. A valve device according to claim 4, whereinthe control unit is arranged to control the rotation of the rotary motorin response to the sensed crank shaft position.
 6. A valve deviceaccording to claim 4, wherein said valve body is arranged to becontrolled by means of the control unit in order to adjust the number ofrevolutions per time unit of the combustion engine.
 7. A valve deviceaccording to claim 3, wherein a second sensor member is arranged to sendthe number of revolutions per time unit of said combustion engine, andthat the control unit is arranged to control the rotation of the rotarymotor in response to said number of revolutions.
 8. A valve deviceaccording to claim 1, wherein the valve body includes at least onecavity apart from said passage.
 9. A valve device according to claim 1,wherein the rotary motor includes an electric rotary motor.
 10. A valvedevice according to claim 9, wherein the electric motor includes asynchronous motor.
 11. A valve device according to claim 10, whereinsaid connecting member includes magnets including a material selectedfrom the group comprising samarium/cobalt alloys and noedynium.
 12. Avalve device according to claim 1, wherein the rotary motor includes apneumatic rotary motor.
 13. A valve device according to claim 1, whereinsaid axis of rotation is substantially perpendicular to the direction ofsaid passage.
 14. A valve device according to claim 1, wherein saidcombustion engine includes more than one combustion chamber each havingrespective valve body and wherein said valve body for at least twocombustion chambers have a common axis of rotation and are connected toeach other by a power-transferring connecting member.
 15. A valve deviceaccording to claim 14, wherein said connecting member includes apermanent magnet of each of said valve bodies and is arranged to enablecontact-free power transmission from one valve body to an adjacent valvebody.
 16. A valve according to claim 14, wherein said connecting memberincludes a connecting element extending between two adjacent valvebodies.
 17. A valve device according to claim 1, wherein said valve bodyis enclosed in a sleeve which is arranged to be received by a cylinderhead of said combustion engine.
 18. In a combustion engine having acombustion chamber and including an inlet channel for communicationbetween the combustion chamber and an external space for the supply ofair and fuel to the combustion chamber and an outlet channel forcommunication between the combustion chamber and an external space forthe discharge of combustion gasses from the combustion chamber, theimprovement comprising: a first rotatable valve body which is providedin said inlet channel and including a first passage extending in adirection through the first valve body, the first valve body beingrotatable around a first axis of rotation forming an angle to thedirection of said first passage which is arranged to form an openposition and a closed position of said inlet channel by rotation in onerotary direction around said first axis of rotation; a second rotatablevalve body which is provided in said outlet channel and including asecond passage extending in a direction through the second rotatablevalve body, the second valve body being rotatable around a second axisof rotation forming an oblique angle to the direction of said secondpassage which is arranged to form an open position and a closed positionof said outlet channel by rotation in one rotary direction around saidsecond axis of rotation; and a rotary motor separate from the combustionengine and arranged to provide said rotation of at least one of saidfirst rotatable valve body and said second rotatable valve body, whereinthe rotary motor is arranged to rotate each of said first and secondvalve bodies from one of said positions to an adjacent of said positionsby a first high rotation velocity, to rotate each of said valve bodiesin this adjacent position by a second rotation velocity at a relativelylower rotation rate than said first high rotation velocity, andthereafter to rotate each of said valve bodies from said adjacentposition to the next adjacent positions by the first high rotationvelocity.
 19. A combustion engine according to claim 18, wherein thefirst valve body and the second valve body form a body with a commonaxis of rotation, wherein the direction of the first passage forms anangle to the direction of the second passage.
 20. A combustion engineaccording to claim 19, wherein said angle between the directions of thefirst and second passages is between 30° and 60°.
 21. A combustionengine according to claim 18, wherein the first valve body and thesecond valve body are driven by a common rotary motor.
 22. A combustionengine according to claim 21, wherein a transferring unit having aninput shaft and an output shaft, which do not coincide, is arranged totransfer a movement of rotation of the rotary motor to at least one ofthe valve bodies.
 23. A combustion engine according to claim 18,including a second rotary motor, wherein the first valve body and thesecond valve body are driven by respective separate rotary motors.
 24. Acombustion engine according to claim 23, including a control unitarranged to control the rotation of the rotary motors and wherein thecontrol unit is arranged to control the phase position of one of thevalve bodies in relation to the phase position of the other valve bodyin response to the number of revolutions per time unit of the combustionengine.